Drill

A drill rotatable about an axial line, the drill comprising:

• a flank face;
• a thinning face contiguous to the flank face;
• an outer peripheral surface contiguous to each of the flank face and the thinning face;
• and
• a swarf discharging surface contiguous to each of the flank face and the outer peripheral surface, wherein
• a ridgeline between the flank face and the swarf discharging surface forms a cutting edge,
• the outer peripheral surface is provided with an outer peripheral region, a first margin contiguous to each of the cutting edge and the flank face, and a second margin that is located on a rear side with respect to the first margin in a rotation direction of the drill and that is separated from an entirety of each of the flank face and the thinning face by the outer peripheral region of the outer peripheral surface,
• an outer peripheral portion of the first margin has a back taper with a same angle as a back taper of an outer peripheral portion of the second margin,
• in a direction parallel to the axial line, a first distance between a front end of the first margin and a front end of the second margin is more than or equal to 3 mm and less than or equal to 5 mm, and
• the outer peripheral region is a surface area that extends so as to contact each of the front end of the second margin, a first side surface portion of the first margin, an edge of the thinning face, and an edge of the flank face.